Organ-blower



R. H. SMITH.

ORGAN BLOWER. APPLICATION FIVLED SEPT. 18, 1920.

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INVENTUR.

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ATTYZ Patented Nov. 22, 1921.

UNITED STATES PATENT OFFICE. if

ROWLAND HENRY SMITH, OF BRANTFORD, OlN'TARIO, CANADA.

ORGAN-BLOWER.

Application filed September 18, 1820. Serial No. 411,226.

T 0 all whom it may concern Be it known that I, ROWLAND HENRY SMITH, of the city of Brantford, in the county of Brant, Province of Ontario, Canada, a subject of the King of Great Britain, have invented certain new and useful Tmprovements in Organ-Blowers, of which the following is a specification.

This invention relates to meansfor supplyin air to reed organs and small pipe organs, and particularly to such as are equipped with bellows ordinarily adapted for manual operation, and my object is to devise blowing mechanism which may be attached to any existing organ and which will automatically respond to the demand for wind made by the playing of the instrument.

I attain my object by means of the constructions hereinafter described and illustrated in the accompanying drawing, which is a side elevation, more or less diagrammatical, showing an organ provided with my improved blowing system.

1 is an organ, which is of an ordinary type with one or more manuals provided with playing pedals 2. lVhile the system may be applied to any organ, it is best adapted to read organs or small pipe org'ans provided with one or more manuals and pedals. 3 is the wind chest of the orgain connected with the bellows 4 of ordinary type, 5 being the movable pressure board of the bellows. With the bellows is connected the blower 6 of an ordinary electrically operated type. This blower is connected by the pipe 7 with the bellows, a flexible coupling 8 being provided in the pipe, which permits of movement of the pipe. This arrangement is necessary it the pipe 7, as shown, is connected with the mov able pressure board 5.

9 is the circuit of the motor of the blower, which includes the manually operable starting switch 10 and a rheostat 11 by means of which more or less resistance is introduced into the circuit. he rheostat is operated from the pressure board 5 by the following means. 12 is the movable arm of the rheostat, which is connected by means of a link 13 with a lever 14: fulcrumed intermediate its ends and connected at its lower end with the pressure board, preferably by means of the pivoted link 15. 16 is a shunt circuit normally open, but which, when closed, will cut out the rheostat 11.

This shunt circuit 16 is closed by means of the switch 17 which is connected with the pedal 18. This pedal is the full organ pedal, so that when the full power of the organ is thrown on by the player, the switch 17 is closed and the rheostat shunted. A check valve 19 of ordinary type is provided adapted to prevent back flow from the bellows pipe 7. The ordinary relief valve 20 is provided in the bellows.

The operation of the device is as follows. Normally the bellows are fully expanded and all the resistance of the rheostat is cut out, though it will be understood of course that the operation will be substantially the same if a certain amount of resistance remains in the circuit at the time of starting. When the motor is speeded up, the pressure board 5 moves inwardly owing to the vacuum set up in the bellows and moves the contact arm of the rheostat into successive positions progressively increasing the resistance in the circuit until substantially all the resistance of the rheostat is cut in. Then stops are drawn and the organ keys depressed, a demand for air is at once created, which tends to reduce the vacuum in the bellows which in turn allows the pressure board to move toward the starting position. Resistance is thus cut out allowing the blower to respond to the demand for more air. As more and more stops are brought into use, the demand for air is increased and the rheostat is automatically adjusted to enable the blower to respond to the increased demand. If the full power of the organ is to be used, the demand for air is of course at a maximum, while the result of the demand for air is a tendency to contract the bellows and thus to actuate the rheostat to increase the resistance in the circuit. In this case, the connection of the switch 17 to the full organ pedal 18 comes into use, since on the depression of the latter to obtain the full power of the organ, the shunt circuit 16 is closed and the rheostat cut out, thus enabling the blower to operate at full capacity no matter what the position of the pressure board may be. I

From the above description it will be seen that I have devised a construction which will satisfactorily attain the objects of my invention as set out in the preamble to this specification.

hat I claim as my invention is The combination with an organ provided with bellows having a movable side, an electrically operated blower communicating with the bellows, an electric circuit for the blower, a rheostat in said circuit, operating connections between the movable side and the i'heostat, whereby movement of the side decreases theresistance' as the bellows colcircuit,'a full organrpedal, and connections whereby the operation of said pedal closes the switch.

Signed at Brantfoid this 6th day of Au- 7 gust 1920; V ROl/VLAND HENRY SMITH.

lVitnesses: V V v F. A. Awrns; L. H. FRASER. 

